diff --git a/kitty/tab_bar.py b/kitty/tab_bar.py
index fd8f0e344..e0a6e71b5 100644
--- a/kitty/tab_bar.py
+++ b/kitty/tab_bar.py
@@ -30,7 +30,7 @@ class TabBarData(NamedTuple):
     title: str
     is_active: bool
     needs_attention: bool
-    tab_ref: ReferenceType['Tab']
+    tab_ref: "ReferenceType['Tab']"
     num_windows: int
     num_window_groups: int
     layout_name: str
@@ -180,7 +180,7 @@ def template_has_field(template: str, field: str) -> bool:
 
 class TabCWD:
 
-    def __init__(self, tab_ref: ReferenceType['Tab']):
+    def __init__(self, tab_ref: "ReferenceType['Tab']"):
         self.tab_ref = tab_ref
         self.saved_val: Optional[str] = None